Term used in English as a noun or adjective to refer to people or works that are experimental or innovative, particularly with respect to art, culture, and politics.
Avant-garde represents a pushing of the boundaries of what is accepted as the norm or the status quo, primarily in the cultural realm. The notion of the existence of the avant-garde is considered by some to be a hallmark of modernism, as distinct from postmodernism.

The term was originally used to describe the foremost part of an army advancing into battle (also called the vanguard or literally the advance guard) and now applied to any group, particularly of artists, that considers itself innovative and ahead of the majority. Read more here